1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * Squashfs - a compressed read only filesystem for Linux
35 	struct page *page = &folio->page;  in squashfs_symlink_read_folio()  local
36 	struct inode *inode = page->mapping->host;  in squashfs_symlink_read_folio()
37 	struct super_block *sb = inode->i_sb;  in squashfs_symlink_read_folio()
38 	struct squashfs_sb_info *msblk = sb->s_fs_info;  in squashfs_symlink_read_folio()
39 	int index = page->index << PAGE_SHIFT;  in squashfs_symlink_read_folio()
40 	u64 block = squashfs_i(inode)->start;  in squashfs_symlink_read_folio()
41 	int offset = squashfs_i(inode)->offset;  in squashfs_symlink_read_folio()  local
42 	int length = min_t(int, i_size_read(inode) - index, PAGE_SIZE);  in squashfs_symlink_read_folio()
47 	TRACE("Entered squashfs_symlink_readpage, page index %ld, start block "  in squashfs_symlink_read_folio()
48 			"%llx, offset %x\n", page->index, block, offset);  in squashfs_symlink_read_folio()
54 		bytes = squashfs_read_metadata(sb, NULL, &block, &offset,  in squashfs_symlink_read_folio()
58 				squashfs_i(inode)->start,  in squashfs_symlink_read_folio()
59 				squashfs_i(inode)->offset);  in squashfs_symlink_read_folio()
67 	 * kmap_atomic to map the page.  Instead call the underlying  in squashfs_symlink_read_folio()
71 	for (bytes = 0; bytes < length; offset = 0, bytes += copied) {  in squashfs_symlink_read_folio()
72 		entry = squashfs_cache_get(sb, msblk->block_cache, block, 0);  in squashfs_symlink_read_folio()
73 		if (entry->error) {  in squashfs_symlink_read_folio()
75 				squashfs_i(inode)->start,  in squashfs_symlink_read_folio()
76 				squashfs_i(inode)->offset);  in squashfs_symlink_read_folio()
81 		pageaddr = kmap_atomic(page);  in squashfs_symlink_read_folio()
82 		copied = squashfs_copy_data(pageaddr + bytes, entry, offset,  in squashfs_symlink_read_folio()
83 								length - bytes);  in squashfs_symlink_read_folio()
84 		if (copied == length - bytes)  in squashfs_symlink_read_folio()
85 			memset(pageaddr + length, 0, PAGE_SIZE - length);  in squashfs_symlink_read_folio()
87 			block = entry->next_index;  in squashfs_symlink_read_folio()
92 	flush_dcache_page(page);  in squashfs_symlink_read_folio()
93 	SetPageUptodate(page);  in squashfs_symlink_read_folio()
94 	unlock_page(page);  in squashfs_symlink_read_folio()
98 	SetPageError(page);  in squashfs_symlink_read_folio()
99 	unlock_page(page);  in squashfs_symlink_read_folio()